sbuf.9: Use .Er for errors and comment out refs to sysctl_wire_old_buffer().
sysvipcd(8): Mark two functions as printf like.
sysvipcd(8): Put SYSV_SEMS related messages under -d.
sysvipcd(8): Clean up log functions a bit.

* Use a larger buffer

* Use snprintf()

* Print to stderr
sysvipcd(8): Oops, remove forgotten brace.